https://www.live-feeds.com/feed/gpt-6-astra-helped-decode-a-217-year-old-cipher-letter-to-napoleon-s-marshalContinuously updated, source-cited coverage. https://www.live-feeds.com/feed/gpt-6-astra-helped-decode-a-217-year-old-cipher-letter-to-napoleon-s-marshalhttps://www.live-feeds.com/feed/gpt-6-astra-helped-decode-a-217-year-old-cipher-letter-to-napoleon-s-marshal#u99470Sun, 04 Oct 2026 17:21:41 +0000AI engineer Carter Church used GPT-6 Astra to decode an 1809 cipher letter sent by Napoleon to Marshal Marmont. The AI processed a low-resolution image of 1,300 symbols, transcribing them and applying a simulated annealing algorithm to crack the homophonic cipher in approximately six hours. The decrypted text details Napoleon's military deployments and his prediction that Austria would fall. Church has released the decoder and key to allow other researchers to reproduce the findings.Why it mattersThe letter had remained unread for over two centuries because the original cipher book was lo